2025/04/18
NOVOSENSE recently announced the launch of the NSDA6934-Q1, a digital-input automotive-grade Class D audio amplifier designed for vehicle audio systems. Featuring four-channel audio output with up to 75W per channel, it supports low-latency mode and sampling rates up to 192kHz. The amplifier offers flexible switching frequencies, multiple modulation options, and comprehensive protection features, making it highly adaptable to various automotive audio system designs.
Class D amplifiers: Driving the evolution of automotive audio
As automotive electronics continue to advance, Class D amplifiers have emerged as the preferred choice for vehicle audio systems due to their high efficiency, low heat dissipation, and compact form factor. These amplifiers not only meet modern vehicles’ stringent energy efficiency demands but also enhance audio quality and power output within limited space, playing a key role in the evolution of automotive audio technology.
Multi-channel automotive audio applications
Optimized Low-Latency Mode: Reducing Path Delay by Over 70%
In automotive audio systems, amplifiers boost signals from the DSP (Digital Signal Processor) before transmitting them to the speakers. Traditional amplifiers can contribute to over 30% of total signal transmission latency, impacting system performance.
The NSDA6934-Q1 features a unique low-latency mode that reduces transmission path delay by more than 70%, granting the DSP additional time for signal processing. This reduces DSP resource demands and enhances the effectiveness of RNC (Road Noise Cancellation). Additionally, the amplifier supports up to 192kHz sampling rates, delivering high-resolution audio with enhanced clarity and detail for an immersive in-car listening experience.
Flexible Configurations to Suit Various Designs
The NSDA6934-Q1 provides a wide range of switching frequencies and modulation options, allowing system engineers to optimize efficiency and size.
Adjustable Switching Frequency (384kHz – 2.1MHz)
At 384kHz, the amplifier achieves up to 93% efficiency, ideal for applications prioritizing power savings, though it requires a 10μH inductor for operation.
At 2.1MHz, the amplifier supports a compact 3.3μH inductor, making it suitable for space-constrained smart cockpit integration.
Selectable Modulation Modes (BD Mode & 1SPW Mode)
BD Mode (50% duty cycle) ensures superior linearity at high power levels, making it ideal for high-output applications.
1SPW Mode (20% duty cycle) reduces conduction losses, improving efficiency in low-power scenarios
Additionally, the NSDA6934-Q1 supports TDM16 data format, ensuring seamless integration with mainstream audio interfaces. With eight selectable I2C addresses, it prevents communication conflicts among peripheral devices. It also features integrated PVDD voltage monitoring, eliminating the need for external resistor dividers and simplifying system wiring and debugging.
Enhanced EMC Performance & Comprehensive Protection
The NSDA6934-Q1 incorporates multiple EMC optimization techniques, including slew rate control, phase control, and three spread-spectrum modes (triangular wave, random spread, hybrid spread), helping customers pass system-level EMC tests efficiently.For system reliability, the amplifier integrates multiple intelligent protection and diagnostic functions, including:
? I2C watchdog for real-time bus monitoring.
? Thermal protection, which automatically reduces gain under high-temperature conditions.
? AC/DC diagnostics for real-time power supply monitoring.
? Comprehensive protection suite, including temperature alarms, over-temperature shutdown, undervoltage, overvoltage, and overcurrent protection, ensuring robust system stability.
Packaging & Availability
The NSDA6934-Q1 is available in an HSSOP56 package and meets AEC-Q100 automotive standards. It is scheduled for mass production in the first half of 2025. For product details or sample requests, please contact the NOVOSENSE sales team at [email protected].
